<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="请输入0-100之间的整数" id="i1">
<input type="button" value="猜一猜" onclick="f()">
<div>结果:<span>0</span></div>
<script>
    //0-100随机整数
    let x = parseInt(Math.random()*101);
    let count = 0;
    let i1 = document.querySelector("#i1");
    let s = document.querySelector("span");

    function f() {
        count++;
        if (isNaN(i1.value)) {
            s.innerText = "输入错误!";
            return;
        }
        if (i1.value > x) {
            s.innerText = "猜大了!";
        }else if (i1.value < x) {
            s.innerText = "猜小了!";
        }else {
            s.innerText = "恭喜你,第"+count+"次猜对了!";
            //次数清零
            count = 0;
            //生成一个随机数,[0,1)*101
            x = parseInt(Math.random()*101);
        }
    }
</script>
</body>
</html>